255-60's will fit on 15x7's on a 70 Swinger

I'm running 245/60R15's on my back. On 15x8 rims. Rims are centered perfectly. It was the widest I could fit without rolling the lips. Even still on the passenger side I get a sllliiggghhhtt rub from the fender lip, there's a small barb there that catches the tire occasionally. Gunna roll them back soon. Make sure of your clearences fellas! Measure measure measure.